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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb9e6f4520ae515b05b928545a9bbddc778749934e78ea31a66d55c29bb0f876' 
  AND token = 'T+lbvFsEvsflSv2MprxIt3qXgT57Tg9Jxq2nDybUM4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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