SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5089e33bc9e19fee592b8217918bc99e1a65deef60407e40567a0b0d6b15218b' 
  AND token = 'HpYjvfOTz0hP3YR08dhG/ShKxv/NxUX3QvCZgDNK4EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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