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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0f615a7778ffef51762c92c157500908bdf9060a6feebbc00a930a1f6ccceda' 
  AND token = '9YGyC9Nyejp+Ieu2hYpa+06/Yko8iZr5JXmJPe4sPfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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