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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38735d2acc783b995ca32c809f499a8257f40ccac9e16383dd3e0e8d3ec4b266' 
  AND token = 'R8fG9OeqB5cRzousmUDUs2XCebvF53YhyT+0Qt+Vem8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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