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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61dbf05392a4b29740d050b5cec5a33389a2178bcd3b81cdcd2dca8ceaa4aa15' 
  AND token = 'aYp600ILS8/M9WCS8mC2IdaxPq+i+VVqtOA+4f1FGOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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