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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8caf0f9c92a054876e005cc6fdc0f6beaa700e6e86f2b95adcb9981d4ce3335f' 
  AND token = 'KcE85kWDLg7hFxiY5RXOkQ8TzCbJfUcIDh+BH8ul964=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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