SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fbfbde8e339486349e68d957a7449d8293aa5fe013c5093523f7af614885e0d' 
  AND token = 'NBDdZjBfVQFeD1lna9jjzg9MFX+mfK3UsOmTqlCR6sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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