SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa6bf150f91982ff23e00395cdef439cef3aca8e58a23f5903d0656187c57778' 
  AND token = 'G/C/JaG9m/X3vEO9xrEznYiZxwjVna98Oq2ra2IDAZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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