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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46ce01c3b4acf9b743b037e5dc3ea3980cd130bee02c655ccab0e2d96b72dc7d' 
  AND token = 'OnfwdtpIACnybIt9x4zEHnQX43Q+hmnqeSU5r7JWz5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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