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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af572a72b164902173a764acd8e75e4879de7db7b48933ac56bdf903f466a8b9' 
  AND token = 'lk1lMwpSJbQgLAsgc3Ss8anh7pMT6KCcwLwmMpr4T54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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