SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '869824b08b92d8077df536c550c3c27c2e6bf24f98fb4fcc79184e27ca7453d0' 
  AND token = 'EdhDSxb6lFkEJQrcCC/rVN+nymJaNxqxaBKoUkK3MHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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