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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c89619e8da2af2140e3702a509ab304930ac44501df9e0f1c1c8ee662fe7606' 
  AND token = 'Z0hrnxqZ2C4UrZiXyxnwdZz26Uvii4BnzUsUNe6hIHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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