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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38ea18be756af4b7f04743ce1f8dafbe7e5aae90245b84e2eb69d596522aa085' 
  AND token = 'TGuaexLdXqerF18EuXmSpmhqnl1KlX1QE/xTjuWD94s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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