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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38fbe229a0692afb7b1c4a991eed69944749ab3a2cf818ae4b3cd74ab5fd716a' 
  AND token = 'YDNIpaYFEqEWNk2ldsGA7Fs9RhROa5riFiFZT1sEWRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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