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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7631a7273ae8feba0382cab1037901a384baf4ac2c2496d4128bd1cd23a770b0' 
  AND token = '/SLZilOVUUkdwh9Au7VWjHZatu6SuJhiLU9hrqwskgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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