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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e33b3ed1856d97aabf31799077629463ebe2a5c8c4558927040261c848a0151' 
  AND token = '8Redhdp8SKl4Sch5BacvishJXvmx/M3SzRTRLRFmSZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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