SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de9d48bd35d2711e475e577702da8324601549ba44d1f019079389d6befecfba' 
  AND token = '7P7627BHAuTJXi5xCSBA/IVENfVqfZ3xuw7oK8LZ2uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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