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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97147fdffea657463c5f610f047a1833baec3c653945fcde380aa1cd4e8428c6' 
  AND token = '9Gl6G5f6wWu0XbTI7yMDY5WAUruq9E0Ln3tEhz+9ZDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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