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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '208e3831557bae03a0ab274dd5fb2859ff789c8f3ca7405126833b42b79e8c21' 
  AND token = 'xhuTH/oGv3sOju8L/3guco3IfLoS8MhbUJSBUelbNQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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