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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0efad7b260ab14676aa6ef6d14d051d5994e757d71563ac7a0a41f373f7f1b7a' 
  AND token = 'IdA5/zMdBzuP6NfLs6SPW82a9RvzDCAiqFNZ49kfBas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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