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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3f3f5d88c87705f1e1a43cabdf5e47acf8e9181f782a7121ee678143722e6bf' 
  AND token = 'mWG5QC+Hok2AZuFI8NY0ITkGoDSoJU0dyKSlXdn3Oxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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