SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce7b67d5e7874d18a6984032653f364f9596a653330874f1766a48100dffb89d' 
  AND token = 'qKaYJpSTKWOmpJUKR4hqQs5nbUfvAFq192+3HQWQeTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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