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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71c50e4370cd0ef7b8d7df90c8a3d90f347f3695e4e3aefe7421ec565d519dd7' 
  AND token = 'jBkPUfGI+PPYe6tX73ZLK11QvCjsss7yaLTvzJq79HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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