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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5ab7061188a6be3eb6d2bb0c3d1ff0ba19399e857c620238948546bc3d5ac7b' 
  AND token = 'OYDZvyKAx7N8fePiAAElwxSiKX3fn1eycs0ycf4L0Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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