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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaf66bc660cf35a861112b0e9fde9ba184a30df74e319b13c28c35589f85b800' 
  AND token = '1hdhv8J0XWAt4Kdxir9ac05eR+50dACMI1Q57Db8kkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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