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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7987917cca7ff7d5fbf744230141774c42ed2d85cd8112efa3c63883b62ddf6f' 
  AND token = 'JA0wnjCbLmJz/a0i5ybbnzFgv2Mg4wLLFbdp5jrBLak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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