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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac21d8764dbc5150f490ffb06dd9ff1566299a4382db3399c39f603c9a5ec190' 
  AND token = '9Ytee8v9Z4hHLMRu0v1xvKQhK2RlewaKpj8FpncziqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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