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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5f5cae8f066b11f62422cedb269996a7e0ac85d02b54096139b66cde7bdab54' 
  AND token = 'NCCF5tCrsKMixddR49Yw4ibzNmFeE8BZGULh2KirXKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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