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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b7fe4536dfed7f966c14872ff4489f30a08ed9d7958133ef109d4e909e45663' 
  AND token = 'AGqE62r2IMWZWT8ebbcjDij+ZlvbQ5HZvrxN0BTqNBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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