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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba9f8e9dfa56a2d29ce496126becacc015771c939ca492336dcc2c22b8bdb68f' 
  AND token = 'fpYK0Viz/atOkkmAHaEDMPiPR5SO14nZ+eQ+zFoxm7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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