SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2e4a3da68f631437bca6c0010975e5f6f14aa9d0359629841b47aa0023dae44' 
  AND token = '4p12CFycdFZHYhbjiD1LPmpNKzV3hFh6jnl8yjpjzuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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