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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd17ee4a789eec73c140ac3ff56497ea48e9a4612b962ac750278822a6272195f' 
  AND token = 'TVCtjlB720HbCOeSej1Xg42r5KAmh5XfYBIWvJ672hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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