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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06d29b1ab727b36ef1cbeeeeefa86873eff7dde0c40e037e9102e3d28f546469' 
  AND token = 'gBsWGk0OYXAWBjj8nRHfn+YSPdGq96ascHTp5584yxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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