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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '668037a15b7350710473aa6c6a51117a2c4e6c04f78949b6a67ddc5794286bad' 
  AND token = 'u2iGUDVq9ATyxcSqpEFe4pENqq5oqAzfQ4nXWwSaV54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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