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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf796708c520ce5d7bdad1372c4c3d571f71a39c0f87ab7b6410fc2f7ee06db1' 
  AND token = '/SZsvO0ssOHHHzVX6tKdGGGahiwAT0MRaylc1WjFbCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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