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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74493e80fbc7f069d98d6af57eca27d2bc6b36727c9d6cdb7edeb08ecb6106b8' 
  AND token = 'Gp3VrRkfZnC37n87w1gsctA6hLhJPmzh4/4ASPwmX8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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