SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11031fa3b110439582e7b63dd1f1e1c8ebb22f8563849d853e42fc2207e21c42' 
  AND token = 'hsaITrqwBTjGw+dIM56cK+A7Qh7y3QyZ3B51VQW4tvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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