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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc982b28ca25046f75512e13faf68fb9eb6ab200900895f7e3dc72769420549b' 
  AND token = 'D79YzTkr+DIRRyoBACoxhRNFROY7HnSQnjrh02MbVzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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