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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0e351e42454d7fa6a4ca68119fb3d741a2dfedd55301fb3c14d9717f92ecd28' 
  AND token = 'HcPEqfh1oqrxS1cOoDRKaBBKvmcS38vvY+TCbwxbDA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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