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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9edb8a20f1cf7d8dfc1dad722a0867b7ca62330a1078f5e22a9cd9c600fff756' 
  AND token = 'KFm75w7h9g3udWn2WVh+OcoNk+3z4l155mtndkCCqp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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