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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '192baac7f1484f75f2ecd42d9ac4ec72aa988fb2fea5906e6a0aa4ee3b41ee61' 
  AND token = 'e5H2LPe3WkeTaJJFD78l0+g5EEaPGupVKvS4HlKVDMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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