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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6891316988ca239c97317aaf9ae639575c4789ccae2b0c955b0ce860e94f6ab3' 
  AND token = 'kivEByYjkq7/SZq6mV8jTvcFcGdsicPiXSc1Yvb3GTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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