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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08470061997912544754bba50888dc70d61b5f23a1307842c6392f1522a3c99e' 
  AND token = 'H6AbD/Za7SDmRAGum5Zl4xjG0o2akXzr710bAkHqDVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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