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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1b9eb1597bfca4c1a188ffa2d176f5391adeae45bdf18bfed29ba3a22edfb5d' 
  AND token = 'iqSPUVNwz0Nh6ULzwN1XzoJC/ke2nqyz/xgzLCTVofw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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