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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e1e2a918ba7f3d071dc3a81ceadcc51db2d1195aea6dd3aeb60fccb3225dfa5' 
  AND token = '2F5Lv8fMk6UoT/IjITk28lxZ4xDhLJoGRHQreBGHNO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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