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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3a2e4ae0e197f810e7837a4df72fdf2ac4d2279f5b6e522e4be2f2723211c5e' 
  AND token = '1P9ZrNiTTxTfjJEmqhzYSAQgZRO/9HEceaaoGsKKyKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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