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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4eb604a63692a8bc2f9b63141adc162b881daa60fab7a5e14ce4727eb8e81ff5' 
  AND token = 'Reko31gmMAoBqVk+iJNP14wASr8mJTA1v8sv9//NBqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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