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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d30f5cbf987eaa79aca5eb12865fc40280b9339e7b9c72bbf95c2acdc40db20' 
  AND token = 'w2xz3KYdYG9FLusTIFGtcFldp9GDXiIV00UahONyLWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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