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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86b941a3690483715380856d20cb082464c7e553440c2305e42657081a297068' 
  AND token = 'WNoju+v9JnpE8uP5L8KXoA+mGGT/F3AtwyoPEtmQWys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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