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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '318161e47e202f9251d8f99bf870e970ae6f7702482f0a30cd366e628a573c2f' 
  AND token = 'alj1mROtAHPxHULHRLLgYSbElbierfP06R4W+q9gqS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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