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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b5446eb55a45fbfb557fe2d4a9e030a14f2a1669c44124871c7a4e97ff82cca' 
  AND token = 'jspOjhQI1aiTmaN0HShiO2P1woi8Fsr6ZzLLbr+f2+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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