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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '828e1dba59ce40774f4f67d9efacb7e954be71d15e8d4a4c2545114815146768' 
  AND token = 'CjaZIucHVemTpdFcMJkMO3/YkJAwHk2dFmA0eZ8y3mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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