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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12eb49a10b5a6d690f584a70d1d8f93a39077680900b8d7bbeb9ece6492ae29b' 
  AND token = '/m0GsGP+PiPqCkzemSM76pCbzoD5Xbw6nVjtU3nSTU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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