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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae22a3540c65294ca4fdf40fe18d7d6811c9375e5a271c2883a939d7fc54c8ab' 
  AND token = 'jF3VNPihj1HPC72aDu08cyZI8dCcmZpXv1mD7LzEVJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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