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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ee02774920ee6707a947d1ec83ca4b35fd2fb44753b4ef71a03b317e8192c54' 
  AND token = 'Auv2t8gxHxo9mSJqGvQTcL4vcQ78uk3NY2bIiap9vQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}