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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77b5cb592d2c9fde659eeda3de892c2a85e19c2d56353d24f80a464e1090682c' 
  AND token = 'sm0d/MkGmpwoZ813q9I8+Gngm6DiGygyCbVru6lciRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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