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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '717ff1a45afd1646784aa9a0ccc05d84643c51fe7e1f737ae0c3149302109da7' 
  AND token = 'H757ul1K60LTAuH/ymi2LS5XPhQIcf2oT6doNuFZ0cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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