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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89ff43fb93230aa0f7e48c07db65c1239dcc0e3d01e4c4d31b0c04afc75d75b6' 
  AND token = 'ZkRxilHsXDM/LJ/th91h5NbasmfWUWRH0ivaFVzKW14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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