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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb4c7c08de70cf1ae87d8cb756e542668373b5139b5182cabc6fc6409bc626d4' 
  AND token = 'lrCjZwYuUqF75lRpC1wD6y02sSCySKT6LeYbO9c9qiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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