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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a840f25d52e316a1d721e90e784538ef4792cceb830772ba818d7553d21dd93e' 
  AND token = '5wojMSTlktqYX1FUuu+hIu7rN2cDkzpcrKdeAgqldt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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