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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfdc8e7aa4d779f205090a7e92ddc6fd67738490fb7fc94b9eecac4dbd35c217' 
  AND token = 'z9xBaP8+J3ZPmAmITddPJOTyhYbpLz7g/QGAk/J04Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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