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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4d33cad7a324705363ce6ff18c79d9d031ac0807d7a3e4f4236ae534414e680' 
  AND token = 'PMTCyILwhtiHE0IPi92xwCYpzkuzNcLUWxYhiz4ThSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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