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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30af873e1d42347609f2817f151353a096c9173439c6fa951a9c415fa6817816' 
  AND token = 'CsOI7KhlyfOEeho38OQ7O3I4fGRZo0+l7mf+L0+DHPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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