SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1465e54ffca0f75c181d17c30f5138193996d6db9c4be66bffe877186d5429a7' 
  AND token = 'vO1J0WmWKcbqhJr3MsIUow9xpjJ/tj0w281ACiiUVac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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