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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '708f07dbcc50cae301f3e4dff521e8e37c44ef54eb26ecde7d453152ce2812c5' 
  AND token = 'Sn4TzzjaN4DKAJ65UpOMZx3Y49/R2emTxU9H7q5CJWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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