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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11bec22058028b0c0898303c15fd30234758fdb517744e250df9ec6cee010abd' 
  AND token = 'pSosmU3f6a2H9K/KKOGQhfHXNo9JMoMr12EU7On65W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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